That would boil down to keeping the realtime clock messages but removing the transport ones. You can either use a filter (eg. Midipal) or I guess one could just hack the firmware. Afaik you can’t disable transport messages in Yarns, but it never occurred to me to check if it’s possible so I could be wrong.

It should also be noted that often you can disable receiving of transport messages, so maybe it’s just a matter of how you organize the signal chain.
For example, the Octatrack let’s you enable/disable clock and transport independently for both MIDI input and output. If you turn it off you can filter out the transport messages so it’s just a matter of putting all the other instruments after it in the signal chain.

This would be lovely! The Mother-32 has a bug where the midi start runs the sequencer… it is incredibly annoying and there’s no way to shut it off! I built a variant of the midipal but it would be awesome to not have to hook it up every time I want to connect to my m32 from my DAW. Great idea, Louis!